Process to reduce the felting and creasing of wool



rnoonss To nnnucn FELTING AND CREASING or Woo No Drawing. Application June 25, 1956 Serial No. 593,375

Claims priority, application Switzerland July 18, 1955 6 Claims. (Cl. 8127.6)

The present invention is concerned with an improvement in the chlorine processing of wool in order to reduce the felting andcreasing of same. It also concerns the material made fast to felting and creasing by this improved process. g V A simple process for the chlorination of wool material consists in treating the same with acid, aqueous solutions of chlorine or hypochlorous acid. The greatreactivity of chlorine to wool leads, on'direct application'because of quick locallinkage, easily to irregularitiesin'that some parts of the material are under-chlorinated and others over chlorinated. Due to its altered handle, the reduction of its solidity and elasticity in places and to its irregular absorptive power for dyestuffs, such non-uniform material has great disadvantages. 7

Many suggestions have already been made for the removal of this unfavourable condition. Among others, it has been suggested, for example that the reaction of the chlorine be retarded by the addition of ammonia or amino compounds or, to reduce its injurious effect on the wool, that the wool be treated before chlorination with polymerisable compounds, e.g. formaldehydemelamine condensation products, and then the latter converted by hardening on or in the material into a stable protective coating.

It has now been found that on chlorinating wool in acid aqueous solution with chlorine which may be obtained from the alkali salts of hypochlorous acid, the too great rapidity of chlorination and the non-uniformity of the material caused thereby can be excellently reduced in a simple manner if the chlorination is performed in the presence of hydroxy alkylated 2.4.6-triamino-1.3.5-triazinyl compounds which contain at the three 'amino nitrogen atoms at least 4 hydrogen-atoms but no aromatic substituents and each hydroxyalkyl group of which has at least two carbon atoms.

As such compounds usable according to the present invention, in particular the monohydroxyalkylated derivatives are used, such as e.g. 2-hydroXyethylamino-4.6- diamino 1.3.5 triazine, 2 methylhydroxyethylamino- 4.6 diamino 1.3.5 triazine and 2 (2' hydroxycyclohexylamino 4.6 diamino 1.3.5 trlazine. However, also the di-hydroxyalkylated triamino triazinyl compounds can be used, e.g. 2-l(di-hydroxyethyD-aminol- 4.6-diamino-1.3.5-triazine or the isomeric 2.4-bis-(hydroxyethylamino -6-amino-l .3 .5 -triazine.

'Such compounds have proved themselves very valuable in that even in small amounts such as 0.1 to 0.6%

' of the weight of the goods, they retard the reaction of the chlorine withthe-wool so that uniformly chlorinated material is obtained. On washing in theusual way the.

Wool has the desirable fast ness" to felting and "creasing and has a pleasant, full handle. Undyed material keeping the pH value at 1.5 to at the most 35' (electrometrical measurement) and possibly warming towards the end of the reaction time to complete it. i

The following examples illustrate the invention without limiting it in any way. Where not otherwise stated, parts are given as parts by weight and the temperatures are in degrees centigrade. The relationship of parts by weight to parts by volume is as that of kilogrammes to litres.

Example 1 5 parts of cleaned wool hanks are gently moved about in a bath containing parts of Water, 03 part of concentrated sulphuric acid (98%) and 0.013 part of 2- monohydroxyethylamino 4.6 diamino 1.3.5 triazine. At 15-20 a diluted hypochlorite lye containing 0.075 part of active chlorine is poured in within 15 minutes either in several portions or in a continuous stream. After moving the goods in the bath for 30 minutes, it is dechlorinated with sodium bisulphite solution. Wool yarn which is fast to creasing is obtained which can be dyed very levelly.

In order to more thoroughly wet the goods, a wetting agent can be added to the treatment bath, e.g. an ethylene oxide condensation product of an organic hydroxy compound, e.g. of diamyl phenol.

Example 2 A top around which 300 parts of wool have been wound is treated in a bath containing 3000 parts of water and 18 parts of concentrated sulphuric acid (98%) and 1.5 parts of 2.4-bis-(hydroxyethyl-amino)-6-amino-1.3.5- triazine, with diluted hypochlorite lye the content of which corresponds to 6 parts of active chlorine. On completion of the addition of the chlorinating agent, the bath is heated for a short time to 50 and de'chlorinated at this temperature with bisulphite solution. The wool has similar properties to the wool treated according to Example 1. i

If dyed wool is treated according to Examplelor 2, then apart from the desired fastness to creasing, the material has a more full handle than wool treated with hypochlorite alone. 7 ii I V Listed below are'further hydroxyalkyl melamine derivatives which can be used in the process according to the present invention:

2 (N methyl N hydroxyethyl amino 4.6 diamino-1.3.5-triazine,

2 (N ethyl N hydroxyethyl amino) 4.6 diamino-1.3.5-triazine,

2 (N propyl N hydroxyethyl amino) 4.6 diamino-1.3.5-triazine,

2 (N cyclohexyl N hydroxyethyl amino) 4.6-

diamino-l .3 .5 -triazine,

2. (N a ethyl hexyl N hydroxyethyl amino)- 4.6-diamino-1.3.5-triazine,

2 (18 hydroxy cc methyl ethylamino) 4.6 diamino-1.3'.5-triazine, 7

2 (B hydroxy a dimethyl ethylamino) 4.6 diamino-1.3.5-triazine,

2 (B hydroxy a ethyl ethylamino) 4.6 diamino- 1.3.5-triazine,

2 (fi hydroxy {3 methyl a methyl propylamino)- 4.6-diamino-1.3.5-triazine,

2 (fixy dihYdIOXY propylamino) 4.6 diamino- 1.3.5-triazine,

2 (hydroxyhexylamino) 4:6 diamino 1.3.5 triazine,

Patented July 28, 1959 2 (2' hydroxycyclohexylamino) 4.6 diamino- 1.3.5-triazine,

2 [(di hydroxyethyl) amino] 4.6 diamino 1.3.5.-

triazine,

2 hydroxyethylamino 4 methylamino 6 amino- 1.3.5-triazine,

2 hydroxyethylamino 4 ethylamino 6 amino- 1.3.5-triazine,

2.4 bis (B hydroxy a ethyl ethylamino) 6- amino-1.3.5-triazine,

2.4 bis (B hydroxy B methyl oc methyl propylamino)-6-amino-1.3.S-triazine,

2.4 bis (2' hydroxy cyclohexylamino) 6 amino- 1.3.5-triazine,

2.4 bis (5. dihydroxy propylamino) 6 amino- 1.3.5-triazine.

Some of such melamine derivatives are known or can be produced from cyanuric chloride, hydroxyalkylamines and ammonia by methods known per se.

What We claim is:

l. A process of chlorinating wool inan aqueous acid bath to make the wool fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 3.5, wool which contains 0.1 to 0.6% based on the weight of the wool of a triazinyl compound of the formula wherein X represents a member selected from the group consisting of 18-monoand fi -di-hydroxy substituted saturated hydrocarbon radicals containing 2 to 6 carbon atoms, one of Y and Y represents hydrogen, and the other one of Y and Y represents a member selected from the group consisting of hydrogen, saturated hydrocarbon radicals containing 1 to 8 carbon atoms, and B- monoand fi,'y-dihydroxy substituted saturated hydrocarbon radicals containing 2 to 6 carbon atoms, by chlorinating the said wool with an alkali metal salt of hypochlorous acid at a temperature of 10 to 60 C., and thereafter rinsing and treating the wool with a dechlorinating agent.

2. A process of chlorinating Wool in an aqueous acid bath to make the W001 fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 3.5, wool which 5 contains 0.1 to 0.6% based on the weight of the wool of 4 2 B hydroxyethylamino 4.6 diamino 1.3.5 triazine with an alkali metal salt of hypochlorous acid at temperature of 10 to C., and thereafter rinsing and thereafter rinsing and treating the wool with a dechlorinating agent.

3. A process of chlorinating wool in an aqueous acid bath to make the wool fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 315, wool which contains 0.1 to 0.6% based on the weight of the wool of 2.4 bis 3 hydroxyethylamino) 6 amino- 1.3.5-triazine with an alkali metal salt of hypochlorous acid at a temperature of 10 to 60C., and thereafter rinsing and treating the wool with a dechlorinating agent.

4. A process of chlorinating wool in an aqueous acid bath to make the Wool fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 3.5, wool which contains 0.1 to 0.6% based on the weight of the wool of 2 (N methyl N 5 hydroxyethylamino) 4.6- diamino-1.3.5-triazine with an alkali metal salt of hypochlorous acid at a temperature of 10 to 60 C., and thereafter rinsing and treating the wool with a dechlorinating agent.

5. A process of chlorinating Wool in an aqueous acid bath to make the wool fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 3.5, Wool which contains 0.1 to 0.6% based on the Weight of the wool of 2 (18, dihydroxypropylamino) 4.6 diamino- 1.3.5-triazine with an alkali metal salt of hypochlorous acid at a temperature of 10 to 60 C., and thereafter rinsing and treating the wool with a dechlorinating agent.

6. A process of chlorinating wool in an aqueous acid bath to make the wool fast to felting and creasing, which comprises chlorinating at a pH of 1.5 to 3.5, wool which contains 0.1 to 0.6% based on the weight of the Wool of 2 [(di fl hydroxyethyl) amino] 4.6 diamino- 1.3.5-triazine with an alkali metal salt of hypochlorous acid at a temperature of 10 to 60 C., and thereafter rinsing and treating the wool with a dechloriuating agent.

References Cited in the file of this patent UNITED STATES PATENTS 2,329,622 Johnstone et al. Sept. 14, 1943 2,510,522 Rust June 6, 1 950 2,516,055 Haigh et a1. July 18, 1950 2,661,313 Folkers Dec. 1, 1953 2,663,616 Sulzer Dec. 22, 1953 FOREIGN PATENTS 704,896 Great Britain Mar. 3, 1954 

1. A PROCESS OF CHLORINATING WOOL IN AN AQUEOUS ACID BATH TO MAKE THE WOOL FAST TO FELTING AND CREASING, WHICH COMPRISES CHLORINATING AT A PH OF 1.5 TO 3.5, WOOL WHICH CONTAINS 0.1 TO 0.6% BASED ON THE WEIGHT OF THE WOOL OF A TRIAZINYL COMPOUND OF THE FORMULA 